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Finding the Fourth Proportional to 621,113.81, 857,128.86 and 345,469.80

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Solution

The fourth proportional to 621,113.81, 857,128.86 and 345,469.80 is: 476,743.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,113.81 : 857,128.86 = 345,469.80 : x
  2. Step 2: Convert to fraction form
    621,113.81/857,128.86 = 345,469.80/x
  3. Step 3: Cross multiply
    621,113.81x = 857,128.86 × 345,469.80
  4. Step 4: Simplify right side
    621,113.81x = 296,112,135,838.43
  5. Step 5: Solve for x
    x = 296,112,135,838.43/621,113.81
  6. Step 6: Final answer
    x = 476,743.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.